GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/ssh/lib/../kexecdh.c Lines: 0 23 0.0 %
Date: 2017-11-13 Branches: 0 30 0.0 %

Line Branch Exec Source
1
/* $OpenBSD: kexecdh.c,v 1.6 2015/01/19 20:16:15 markus Exp $ */
2
/*
3
 * Copyright (c) 2001 Markus Friedl.  All rights reserved.
4
 * Copyright (c) 2010 Damien Miller.  All rights reserved.
5
 *
6
 * Redistribution and use in source and binary forms, with or without
7
 * modification, are permitted provided that the following conditions
8
 * are met:
9
 * 1. Redistributions of source code must retain the above copyright
10
 *    notice, this list of conditions and the following disclaimer.
11
 * 2. Redistributions in binary form must reproduce the above copyright
12
 *    notice, this list of conditions and the following disclaimer in the
13
 *    documentation and/or other materials provided with the distribution.
14
 *
15
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25
 */
26
27
#include <sys/types.h>
28
29
#include <signal.h>
30
#include <string.h>
31
32
#include <openssl/bn.h>
33
#include <openssl/evp.h>
34
#include <openssl/ec.h>
35
#include <openssl/ecdh.h>
36
37
#include "ssh2.h"
38
#include "sshkey.h"
39
#include "cipher.h"
40
#include "kex.h"
41
#include "sshbuf.h"
42
#include "digest.h"
43
#include "ssherr.h"
44
45
int
46
kex_ecdh_hash(
47
    int hash_alg,
48
    const EC_GROUP *ec_group,
49
    const char *client_version_string,
50
    const char *server_version_string,
51
    const u_char *ckexinit, size_t ckexinitlen,
52
    const u_char *skexinit, size_t skexinitlen,
53
    const u_char *serverhostkeyblob, size_t sbloblen,
54
    const EC_POINT *client_dh_pub,
55
    const EC_POINT *server_dh_pub,
56
    const BIGNUM *shared_secret,
57
    u_char *hash, size_t *hashlen)
58
{
59
	struct sshbuf *b;
60
	int r;
61
62
	if (*hashlen < ssh_digest_bytes(hash_alg))
63
		return SSH_ERR_INVALID_ARGUMENT;
64
	if ((b = sshbuf_new()) == NULL)
65
		return SSH_ERR_ALLOC_FAIL;
66
	if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
67
	    (r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
68
	    /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
69
	    (r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
70
	    (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
71
	    (r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
72
	    (r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
73
	    (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
74
	    (r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
75
	    (r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
76
	    (r = sshbuf_put_ec(b, client_dh_pub, ec_group)) != 0 ||
77
	    (r = sshbuf_put_ec(b, server_dh_pub, ec_group)) != 0 ||
78
	    (r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
79
		sshbuf_free(b);
80
		return r;
81
	}
82
#ifdef DEBUG_KEX
83
	sshbuf_dump(b, stderr);
84
#endif
85
	if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
86
		sshbuf_free(b);
87
		return SSH_ERR_LIBCRYPTO_ERROR;
88
	}
89
	sshbuf_free(b);
90
	*hashlen = ssh_digest_bytes(hash_alg);
91
#ifdef DEBUG_KEX
92
	dump_digest("hash", hash, *hashlen);
93
#endif
94
	return 0;
95
}